Weil-McLain BMC Install And Operation Instructions

Weil-mclain boiler user manual

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BMC and BMC-6X Installation and Operation Manual

• INSTALLATION AND OPERATION INSTRUCTIONS MANUAL

OUTPUT RATINGS:

120VAC, 6A RESISTIVE

1A PILOT DUTY, 15A TOTAL

FOR ALL CIRCUITS

INPUT RATINGS:

115VAC 60Hz , 30VA MAX

USE COPPER WIRE,

CLASS 1 WIRE ONLY.

ENCLOSED

ENERGY

MANAGEMENT

EQUIPMENT

LISTED

This Weil McLain control is strictly an operating control; it should never be used as a

WARNING

primary limit or safety control. All equipment must have its own certified limit and safety

controls required by local codes. The installer must verify proper operation and correct any

safety problems prior to the installation of this Weil McLain control.

HYDRONIC MODULATING BOILER CONTROL AND EXTENSION

CAUTION

: RISK OF ELECTRIC SHOCK

More than one disconnect switch may be required

99RA

to de-energize the equipment before servicing.

BMC-6X

Full Modulation Sequencing Control

SYSTEM

PROGRAM

RUN

BMC

AND

BMC

---

DO NOT APPLY ANY VOLTAGE

TO INPUT TERMINALS

Part Number 550-100-072/0408

Table of Contents

Summary of Contents for Weil-McLain BMC

Page 1 BMC and BMC-6X Installation and Operation Manual HYDRONIC MODULATING BOILER CONTROL AND EXTENSION • INSTALLATION AND OPERATION INSTRUCTIONS MANUAL OUTPUT RATINGS: 120VAC, 6A RESISTIVE 1A PILOT DUTY, 15A TOTAL FOR ALL CIRCUITS INPUT RATINGS: 115VAC 60Hz , 30VA MAX USE COPPER WIRE, CLASS 1 WIRE ONLY.
Page 2: Table Of Contents
BMC and BMC-6X Installation and Operation Manual BMC LAYOUT ....3 BMC OVERVIEW ....4 Reset Ratio/Outdoor Reset .
Page 3: Bmc Layout
BMC and BMC-6X Installation and Operation Manual Program Switch to restrict access to function changes. This switch is covered with Wiring Enclosure. LED indicates the associated relay status. OUTPUT RATINGS: 120VAC, 6A RESISTIVE 1A PILOT DUTY, 15A TOTAL FOR ALL CIRCUITS...
Page 4: Bmc Overview
Furthermore, additional settings have been added to ﬁne tune this operation, like Offset, Minimum, and Maximum Water Temperature and night setback schedule. STANDBY BOILERS Each of the BMC stages can be conﬁgured as a Standby boiler with an adjustable Standby delay. A boiler can be used as a backup during extended large demand periods. SYSTEM OUTPUT In Set Point mode, this output can be used to activate a system pump, combustion air damper, or perform any other function that is required when any stage is active.
Page 5: Reset Ratio/Outdoor Reset
System Set Point based on outdoor temperature (Outdoor Reset) or it can modulate its stages to achieve an adjustable ﬁxed Set Point. In Outdoor Reset, the BMC controls a hot water heating system to provide a building with comfortable and even heat levels. The BMC varies the temperature of the circulating heating water in response to changes in the outdoor temperature.
Page 6: Make Sure You Have The Right Control
NUMBER OF STAGES • The BMC can be conﬁgured to control up to 4 modulating boilers. It can control up to 16 boiler stages using a maximum of two BMC-6X Panels MODULATION MODE •...
Page 7: Installation
• This feature lets the BMC run the SYS relay for a longer period after the boilers have been turned off. When this relay is used to control a pump, it helps in dissipating the excess heat from the boilers combustion chamber.
Page 8: Install The Sensors
BMC is installed. Determining the proper location for the Outdoor Sensor is very important. The BMC will base the heat on the outdoor temperature information it receives from this location. If the sensor is in the sun, or covered with ice, its reading will be different from the actual Outdoor temperature (OD).
Page 9: Wiring
When Outdoor Reset is selected, the BMC will vary the system Set Point based on outdoor temperature. • Whether in Set Point or Outdoor Reset modes, the outdoor sensor can be used as an Outdoor Cutoff. The BMC will disable all boilers when the outdoor temperature is above the adjustable Outdoor Cutoff temperature. This feature will automatically be activated when an outdoor sensor is connected.
Page 10: Wiring The Prove (Terminals 29, 30)
A typical use of this feature is to check for pump ﬂow before ﬁring any boiler. • If the PROVE input is open on a call, the BMC will enable only the System Output. All boiler outputs will be off when the PROVE input is open.
Page 11: Wiring To Modulating Motors
The BMC and the BMC-6X sources 24VDC excitation voltage for the 4-20mA signal. • Wire the (-) from the modulating motor to the boiler terminal on the BMC marked (GND). That is for boiler A, the modulating (-) terminal will be 13.
Page 12: Menu Sequence
BMC and BMC-6X Installation and Operation Manual ----------- SETTINGS ------------ Season Winter Set Point 70 F <System Settings> <Maintenance> <Histories> <System Startup> BACK SELECT STARTUP -------- SYSTEM STARTUP ------ (START) to continue BACK START ------------- WARNING ------------ THESE SETTINGS CHANGE PRIMARY SYSTEM FUNCTIONS.
Page 13 BMC and BMC-6X Installation and Operation Manual ----------- SETTINGS ------------ Season Winter Set Point 70 F <System Settings> <Maintenance> <Histories> <System Startup> BACK SELECT MAINTENANCE ---------- MAINTENANCE --------- System Trim +0 F Outdoor Trim +0 F Soft-Off Delay 45sec <Output Trim>...
Page 14: Startup Settings
When using Extension panels, connect them prior to conﬁguring the Output Type. Otherwise, the BMC will not conﬁgure them properly. • Select the appropriate Output Type for each of the boilers. The BMC can have a different Output type for each boiler. ALERT A good practice after performing any Startup menu modiﬁcations is to check all operating settings and adjustments to match the new settings.
Page 15: Selecting The Modulating Mode
When Setback is selected, the External Signal option will switch the BMC to Setback mode when shorted on terminals 31 and 32. This allows the BMC to be managed by an external device or control to provide setback. No scheduling or boost menu options will be available with Setback.
Page 16: Sensor Fault
• When All-On is selected, the BMC will turn all boilers On to a 100% when System reads Short or Open and Outdoor is below Outdoor Cutoff. When Outdoor reads Short or Open, the BMC will turn all boilers On to a 100%.
Page 17: Operating Settings
OPERATING SETTINGS PROGRAM CHANGE SETTINGS To be able to change the BMC settings the Program/Run Switch must be set to Program. The switch is located under the Enclosure Wiring Cover for security. The Enclosure Wiring Cover can be securely closed using a lock.
Page 18: Outdoor Cutoff Temperature
(Note: The lowest water temperature the BMC will circulate is 70°F. If the Outdoor Cutoff is turned ON and the Season is set to Winter, the BMC will circulate at least 70°F water even in the hottest of weather.) In the OFF position, the system pump will always be off and all burner stages will be off.
Page 19: System Settings
Many boilers go through a purge cycle before they are brought on line. • When the BMC activates a boiler, it does not start to calculate its output until the Purge Delay is over. This allows the boiler to fully come online and begin producing output.
Page 20: Lag Delay
Adjustable from 0F°/0C° to 75F°/42C° Button: MENU/<System Settings>/<More Settings>/Setback • The Setback feature can be used to provide the BMC with a lower temperature Set Point when less load is required. • The lower Set Point will appear on the main display indicating this condition.
Page 21: Last Stage Hold
In addition to the normal drop experienced between the boiler’s temperature and that read by the BMC sensor, the Last Stage Hold setting must be accounted for. The boiler limit must be set above the Set Point PLUS the Last Stage Hold PLUS the normal drop experienced in the piping.
Page 22: Set Time
PM, scroll through the AM hours to reach the PM hours. Remember that the battery is the backup for the Time. If no power is supplied to the BMC and there was no battery or battery had no power, time values will be lost and will need to be reset.
Page 23: Maintenance
That number will blink for the Soft-Off delay period. • If during the Soft-Off delay period the BMC needed that stage to turn back on, the stage will be released from the Soft-Off delay and resume normal operation. •...
Page 24: Conﬁguration
Display Boiler Modulation Status for possible status. DISPLAY BOILER MODULATION STATUS The BMC boiler modulation status gives immediate access to each boiler status. The following list show all possible boiler status: • Boiler is off due to no call for heat.
Page 25 BMC and BMC-6X Installation and Operation Manual DISPLAY MESSAGES The BMC normal display layout reserved the second line for message indications. The following is a list of the most common Message Display Line information: • Summer The control is set to Summer. No heat is active. See Season on page 17.
Page 26 BMC and BMC-6X Installation and Operation Manual Auto - The BMC will control the boiler’s operation to maintain the desired Set Point. Only boilers set to Auto can be Lead boilers. Standby Standby boilers can only be activated when all boilers in Auto have been at 100% modulation for a selectable period of time.
Page 27: Troubleshooting
Too Much Heat Check if the control has any of the following: Domestic Hot Water call - The BMC will raise the temperature of the system to either 200˚F or • Maximum Water Temperature on a DHW call, connected to terminals 29 and 30. Check to see if there is a call for DHW and the length of time it lasts.
Page 28 BMC and BMC-6X Installation and Operation Manual Boiler Mode Settings - The BMC will only modulate boilers their mode is set to Auto or Standby. Check if any boiler stage is set • to Manual, Off, or Standby. See Mode on page 25.
Page 29: Direct Heating Piping Diagram
Boiler 1 System: The BMC provides 4 modulating boilers. The boilers are piped in Reverse Return on the primary loop. The System output is controlling the System Pump. Weil McLain is aware that each installation is unique. Thus, Weil McLain is not responsible for any installation related to any electrical or plumbing diagram generated by Weil McLain.
Page 30: Direct Heating Wiring Diagram
BMC and BMC-6X Installation and Operation Manual MULTIPLE MODULATING BOILERS DIRECT HEATING WIRING DIAGRAM OUTPUT RATINGS: 120VAC, 6A RESISTIVE 1A PILOT DUTY, 15A TOTAL FOR ALL CIRCUITS INPUT RATINGS: 115VAC 60Hz , 30VA MAX USE COPPER WIRE, CLASS 1 WIRE ONLY.
Page 31: External 4-20Ma Set Point
BMC and BMC-6X Installation and Operation Manual MULTIPLE MODULATING BOILERS EXTERNAL 4-20MA SET POINT USING 4-20MA EMS INTERFACE OUTPUT RATINGS: 120VAC, 6A RESISTIVE 1A PILOT DUTY, 15A TOTAL FOR ALL CIRCUITS INPUT RATINGS: 115VAC 60Hz , 30VA MAX USE COPPER WIRE, CLASS 1 WIRE ONLY.
Page 32: Specifications
Add-On BMC-6X Panels: ....... .up to two BMC-6X Panels using RS485 Ignition Point %: .

This manual is also suitable for:

Bmc-6x